I am using Firefox 28, on Mac OS X 10.6.8 Snow Leopard on a MacBook Pro 6,2. The drop-down menu for HTTPS Everywhere 3.5.1 under the "Tools" menu in Firefox does not appear at all when I hover my mouse over the "HTTPS Everywhere" menu item. When I look at the preferences for HTTPS Everywhere, the redirection rules are all blank. I tried clicking "reset to defaults". It had no effect. When I try to connect to a site, such as www.youtube.com, I get the normal http version, not the https version. If I manually enter https://www.youtube.com, I get the https version. I tried un-installing and re-installing HTTPS Everywhere 3.5.1, as well as installing 4.0development.15, and 4.0development.16. The problem still persists. My active Firefox add-ons are: Adblock Edge 2.1.1 BetterPrivacy 1.68 Download YouTube Videos as MP4 1.7.18 DownloadHelper 4.9.22 DownThemAll! 2.0.16 DuckDuckGo Plus 0.3.16 Firebug 1.12.8 FxIF 0.4.7.1 Ghostery 5.2.1 HTTPS-Everywhere 3.5.1 Screengrab (fix version) 0.97.24c User Agent Switcher 0.7.3 I also use Tor Browser 3.5.4, which includes the HTTPS Everywhere 3.5.1 add-on. HTTPS Everywhere works properly in Tor Browser 3.5.4. I also tried using HTTPS Everywhere 3.5.1 in Firefox 28 on OS X 10.9.2 Mavericks. HTTPS Everywhere works properly in Firefox on Mavericks. My active Firefox add-ons in Mavericks are: Adblock Plus 2.5.1 BetterPrivacy 1.68 DuckDuckGo Plus 0.3.16 Firebug 1.12.8 Ghostery 5.2.1 HTTPS-Everywhere 3.5.1 User Agent Switcher 0.7.3